Spring-balance with tare device



(No Model.)

J. S. PRAY & H PIGG. Spring Balance with Tare Device.

No. 243,539. Patented June 28,1881.

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. spring-scales provided with means for regulat- UNITED STATES PATENT 7OFFICE.

JOHN S. FRAY AND HORACE PIGG, OF BRIDGEPORT, CONNECTICUT.

SPRING-BALANCE WITH TARE DEVICE.

SPECIFICATION formingpart of Letters Patent No. 243,539, dated June 28,1881.

Application filed March 8, 1881.

To all whom it may concern:

Be it known that we, JOHN S. FRAY and HORACE PIGG, citizens of theUnited States, residing at Bridgeport, in the county of Fairfield andState of Connecticut, have invented certain new and useful Improvementsin Spring- Scales; and we do hereby declare that the following is afull,clear, and exact description of the same, reference being had to theannexed drawings, makinga part of this specification, and to the lettersand figures of reference marked thereon.

Figure 1 of the drawings is a front elevation of our invention with thecasing and weighing dish or platform in section, and Fig. 2 is a sideelevation with the casing and a portion of the operative mechanism insection.

The present invention has relation to certain new and usefulimprovements in that class of in g the tare.

The object of the invention is to simplify the mechanism for regulatingor taking up the tare, whereby there is less danger of any inaccuracy inweighing by the spring or other sensitive parts of the operatingmechanism becoming out of order. These objects we attain'by theconstruction shown in the drawin gs and hereinafter described.

In the accompanying drawings, A represents the upright casing to receivethe operative mechanism, the front side and top being removablyconnected thereto in any suitable manner.

Afra1ne,l3,is cast or otherwise formed with a standard, a, which passesup through an opening in the top of the casing A, and has connected toit a suitable weighing dish or platform, 0. The frame B has pivoted toits upper and lower sides cross-arms D, the opposite ends of thecross-arms being pivoted to the rear side of the frame A, or to carsupon suitable arms rigidly connected thereto, as found desirable.

A right-angle lever, E, is pivoted to ears I) projecting from the backof the frame A, and to the end of the horizontal portion of the lever isconnected one end of a coil-spring, c, the lower end thereof beingconnected to the frame B by screw 01, so that the tension of said springmay be regulated when required. To the front of the casing A, and uponthe interior, is secured a bracket, 6, which forms bearings for (Nomodel.)

the journals of a pinion, f, the front end of the journal projecting outbeyond the dialplate 5/, and has irregular sides, or is formed square toreceive the pointer or hand h.

A rack-bar, i, is pivoted at its upper end to the frame B, and hasconnected to it and the frame a suitable spring, It, to keep the teethof the raclcbar engaged with those of the pinion. Thus when the dish orweighingplatform C is depressed by any weight placed thereon the frame Bwill be correspondingly depressed and carry with it the rack-bar 'i,which will cause the pinionfto rotate and the pointer or hand It toregister the weight upon the dialplate 9.

A rod, F, passes horizontally through the front of the casing A, and hasscrew-threads upon its end to engage with a screw-threaded opening inthe lower end of the rightangle lever E.

Itshould be noticed that the spring 0 is arranged vertically, and at itsupper end it is connected directly to the horizontal portion of theright-an gle leverE, in place of being located horizontally between thehorizontal operatingrod and the lower end of the right-angle lever. Theadvantages of this change of location of the spring crenders theadjustment much more sensitive, for the reason that there are a lessnumber of bearing-surfaces, and consequently more certainty of action.

Having now described our invention, what we claim as new, and desire tosecure by Letters Patent, is- 1 I11 aweighing-scale, the frame B, havingpivoted thereto the cross-arms l), the opposite ends of said arms beingpivoted to the casing A, in combination with the right-angle lever E,connected to the frame B by spring 0, and operated by a rod, F, thescrew-threads thereon engaging with a screw-threaded opening in thelower end of the right-angle lever, substantially as and for the purposeset forth.

In testimony that we claim the above we have hereunto subscribed ournames in the presence of two witnesses.

JOHN S. FltAY. HORACE PIGG. Witnesses to the signature of John S. Fray:

L. S. CATLIN, T. M. PALMER, Jr.

Witnesses to the signature of Horace Pigg:

H. J. ENNIS,

D. ODONNOGHUE.

